That's sick! Humans identify infected peers from a photo

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Human beings can spot a sick person, on a photo, a mere two hours after he or she was infected by a germ, researchers said Wednesday. "An ability to detect sick people would allow people to avoid being close to sick people, and hence minimise the risk of becoming sick if the person is a carrier of contagious disease," study co-author John Axelsson of Stockholm University told AFP. The volunteers had their photo taken about two hours after each shot -- thus once in a healthy state after receiving the placebo, and once "sick".

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